Enter your Wall Width, Height, and Wall Type — plus any Gable Height, Doors & Windows Area, Waste Allowance, and Cost per Sq Ft — and the Siding Calculator gives you Total Siding Needed alongside Wall Area, Siding Squares, Waste Amount, and Estimated Total Cost.
Total Siding Needed
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Wall Area
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Siding Squares
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Waste Amount
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Estimated Cost
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To calculate siding needed, measure the width and height of each wall, multiply for square footage, add gable area if applicable, subtract doors and windows, then add 10% for waste. Our calculator does this automatically for each wall section.
A siding square covers 100 square feet. If you need 1,500 sq ft of siding, that's 15 squares. This is the standard unit contractors use for pricing and ordering siding materials.
Add 10% waste for standard installations, or up to 15% for complex designs with many cuts. This accounts for mistakes, damaged pieces, and future repairs.
Yes, subtract the total square footage of doors and windows since these areas won't need siding. A standard door is about 21 sq ft, and an average window is 12-15 sq ft.
For gable walls, calculate the triangular area by multiplying the wall width by the gable height (peak to eave), then divide by 2. Add this to your rectangular wall area.
Siding costs vary by material type (vinyl $2-7/sq ft, fiber cement $5-12/sq ft, wood $6-15/sq ft), quality, brand, and local market prices. Labor costs typically equal material costs.
Yes, measure and calculate each wall separately, then add the totals together. Different sides may have different numbers of windows and doors to subtract.
Siding calculators provide good estimates for planning and budgeting, but always have a professional measure for final material orders. Complex architectural features may require additional material.